Synthesis of hierarchical flower-like ZnO nanostructures and their functionalization by Au nanoparticles for improved photocatalytic and high performance Li-ion battery anodes
Synthesis of hierarchical flower-like ZnO nanostructures and their functionalization by Au nanoparticles for improved photocatalytic and high performance Li-ion battery anodes
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DOI：
10.1039/c1jm10720h
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发表时间：
2011-01-01
影响因子：
--
通讯作者：
Zhu, Jing
中科院分区：
文献类型：
--
作者：
Ahmad, Mashkoor;Shi Yingying;Zhu, Jing
本文采用溶液相法合成了具有可控形貌和尺寸的分级花状ZnO纳米结构，并结合电沉积技术制备了Au纳米粒子（AuNPs）功能化的ZnO纳米结构，以探索其新的应用。研究了这些杂化纳米结构的光催化活性和储锂容量。结果表明，杂化纳米结构结合了小尺寸金纳米粒子的大比表面积、稳定性和催化活性，具有比纯ZnO更高的光催化活性。首次放电容量为1280 mA h g（-1），50次循环后的可逆容量超过392 mA h g（-1），远优于以往报道的ZnO阳极。Au-ZnO电极的储锂容量和循环寿命的提高是由于Au-ZnO相的Li活性。Au-ZnO杂化纳米结构的光催化和电化学活性为储能、环境修复和生物降解应用提供了新的平台。
In this article, hierarchical flower-like ZnO nanostructures with controlled morphology and dimensions have been synthesized by solution phase approach and functionalized by Au nanoparticles (AuNPs) with the combination of electrodeposition to explore novel applications. The photocatalytic activity and lithium storage capacity of these hybrid nanostructures have been investigated. It has been found that hybrid nanostructure combining the large specific surface area, stability and catalytic activity of small AuNPs, demonstrate the higher photocatalytic activity than that of pure ZnO. Furthermore, an initial discharge capacity of 1280 mA h g(-1) and a reversible capacity over 392 mA h g(-1) at the 50 cycles are achieved for the Au-ZnO hybrid nanostructure, which is found to be much better than that of any previously reported ZnO anodes. The improved lithium storage capacity and cycle life of the Au-ZnO electrode result from the Li activity of Au-ZnO phase. The photocatalytic and electrochemical activity of Au-ZnO hybrid nanostructures provide a new platform for energy storage, environmental remediation and photocatalysis applications.